[R] The elegant way to test if a number is a whole number

[Jason Morgan]

Hello Alex,

Have you tried the modulus operator?

> 2 %% 1
[1] 0
> 2.1 %% 1
[1] 0.1

~Jason

On 2011.09.08 20:27:14, Alexander Engelhardt wrote:
> Hi,
> 
>      x <- 0.2*5
>      is.integer(x)
> 
> gives me FALSE because R stores it as a float number, right?
> Is there an elegant way to work around that problem? Right now
> I'm using
> 
>      x <- 0.2*5
>      round(x) == x
> 
> which returns TRUE. But more strictly I should use all.equal(),
> right?
> 
> I somehow just don't like the--pardon--ugliness of those pieces
> of code. Maybe there is a beautiful way to write that. If not,
> no big problem -- I just like beautiful code :-)
> 
> Cheers,
>   Alex
> 
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-- 
Jason W. Morgan
Ph.D. Candidate
Department of Political Science
*The Ohio State University*
154 North Oval Mall
Columbus, Ohio 43210